Welcome and you have done the same thing I did the first time as well as most people here. By posting to a reply to a thread after a Google search instead of starting your own thread.
Hope you feel comfortable enough to return and post some images of your coin. There are actually quite a few reasons the coin might be discolored but like the others said, images are needed.
Thanks for taking the time and look forward to the images. Both sides as well as a closeup if you can.

Presently here is an inquiry for you, when you get a cluster of coin to look how would you approach seeking them? I take a gander at every one except the however the ones one the rundowns closer. Is there a good and bad approach to seek coins if that bodes well as an inquiry?

Daniel Malone... I can't figure out how to write you a letter and send you a picture of a 2018 D penny that I found can you respond by sending your email address or anything where I can send you a picture you can look at it
Thanks.Scott ABBOTT